.layui-card(style="margin-top: 5vh;")
    #page-canvas(style="height: 80vh; border: 1px solid")
    button(
        v-on:click="changeBtn()" 
        class="layui-btn layui-btn-fluid"
        style="right: 10vw; position: absolute; top: 15vh; width: 90px;"
    ) 连续转动 